UFC 131 is right around the corner and the main event will feature two of the hardest-hitting men in the sport, Junior dos Santos and Shane Carwin. This fight is not only for a chance to face Cain Velasquez for the UFC heavyweight championship, but also could be one of the most brutal knockouts in UFC history.

Shane Carwin has not fought since fighting Brock Lesnar in a losing effort at UFC 116 for the undisputed heavyweight championship of the world. In that fight, he caught Lesnar but punched himself out and ended up losing via submission in the second round.

Since that fight, Carwin has had back surgery and has also lost 30 lbs. He appears to be in the best shape of his life, and now has yet another chance to be back on top in the heavyweight division.

Junior dos Santos is one of those guys who comes along once in a lifetime. His striking ability is easily top-tier pound for pound in the world, but his ground game is unknown. He trains with the Nogueira Brothers, and is a BJJ brown belt. In all truth, he looks like the fighter that is the perfect mix of both Nogueira brothers.

Dos Santos has been to decision only once in his entire career and that was in his most recent bout against Roy Nelson. It would take a Mack Truck to knock him out. This fight means everything to Dos Santos, since he is already the No. 1 contender, but in order to stay active, he decided to put his title on the line and face Shane Carwin.

This fight has virtually zero chance of going to decision. In a combined 26 fights, there has only been one decision in that span and 18 total fights ended due to strikes. Carwin has the advantage in the wrestling department, but JDS has the better striking. Carwin had more power in his fists in previous fights, but losing 30 lbs leaves a big question mark in that equation.

This fight could, and should, be the heavyweight fight of the year and has a chance at being KO of the year. If you are a fan of the knockout, then this is a fight that you must see.

Now we will discuss the 10 greatest knockouts in UFC history. After this weekend, this fight may make this list.